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• Displaying Bitmaps sequentially, "like a video"

  15 juillet 2015, par Wamasa

  I’m trying to reproduce a video that is not android supported (like a .wmv video) in my app, and actually I’m able to grab every frame and create a Bitmap of it.

  So, now, I’m trying to show those bitmaps in a VideoView (or any other view), sequencially, something like a video.

  Some code :

  while (true) {
  
                  frame = frameGrabber.grab();
  
                  if (frame == null)
  
                      break;
  
                  frame2 =
  
                          IplImage.create(frame.width(), frame.height(),
  
                                  opencv_core.IPL_DEPTH_8U, 4);
  
                  opencv_imgproc.cvCvtColor(frame, frame2,
  
                          opencv_imgproc.CV_BGR2RGBA);
  
  
  
                  bm =
  
                          Bitmap.createBitmap(frame2.width(),
  
                                  frame2.height(), Bitmap.Config.ARGB_8888);
  
                  bm.copyPixelsFromBuffer(frame2.getByteBuffer());
  
                  canvas = new Canvas(bm);
  
                  mVideoView.draw(canvas);
  
                  canvas.save();

  It looks like I can grab every frame of the video (using ffmpeg), but I just don’t know how to display them.

  By the way, I’ve already tried encoding this video to a .mp4 file and playing it on the VideoView, but it takes much time to process the whole video (1 hour), so, now, I’m trying to display it right away, without encoding it do .mp4 (or any other android supported video)

  Any advices ?

• FFMPEG always stops to stream after 3 min

  23 août 2018, par Diogo Perdomo

  When I start

  ffmpeg -y -i rtsp ://mycameraip/video.mp4 -an -codec copy file.mp4

  ffmpeg stop ever the same time. Whats is happening ?

  Return :

  Input #0, rtsp, from 'rtsp://<ip>/video.mp4':
  
    Metadata:
  
      title           : QStream
  
      comment         : QStreaming Media
  
    Duration: N/A, start: -0.066667, bitrate: N/A
  
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 15 tbr, 90k tbn, 15 tbc
  
      Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
  
  Output #0, mp4, to 'file.mp4':
  
    Metadata:
  
      title           : QStream
  
      comment         : QStreaming Media
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 15 tbr, 90k tbn, 90k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=  750 fps=4.2 q=-1.0 Lsize=     345kB time=00:02:59.47 bitrate=  15.8kbits/s speed=   1x    
  
  video:336kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.839756%
  
  </ip>

• Demuxing a video media file with FFMPEG

  23 février 2016, par MOHW

  After starting this question Extracting the h264 part of a video file (demuxing) I was actually able to figure out that,

  1. When I reverted to an older version of FFMPEG (avcodec-55.dll) as against the avcodec-57.dll I was using earlier, the code worked perfectly without any error and the resultant h264 file played with ffplay.
  2. When I tracked my output when using the avcodec-57.dll version of FFMPEG (most recent version), there was actually an error "Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead" after the call avformat_write_header(ofmt_ctx_v, NULL) and another one after the call to avformat_write_header(ofmt_ctx_a, NULL). The program continued executing, the audio was fine but the .h264 file wasn’t.

  The output

  Press any key to continue . . .
  
  Press any key to continue . . .
  
  Press any key to continue . . .
  
  Press any key to continue . . .
  
  
  
  ==============Input Video=============
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'sample.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : 10153755968775490
  
      encoder         : Lavf57.19.100
  
    Duration: 00:01:07.27, start: 0.020021, bitrate: 1058 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 400x224 [
  
  SAR 199:200 DAR 199:112], 927 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 12
  
  8 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  
  
  ==============Output Video============
  
  Output #0, h264, to 'sample.h264':
  
      Stream #0:0: Video: h264 (High), yuv420p, 400x224 [SAR 199:200 DAR 199:112],
  
   q=2-31, 927 kb/s, 30 tbc
  
  
  
  ==============Output Audio============
  
  Output #0, mp3, to 'sample.mp3':
  
      Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 128 kb/s
  
  
  
  ======================================
  
  [h264 @ 00a3ee20] Using AVStream.codec.time_base as a timebase hint to the muxer
  
   is deprecated. Set AVStream.time_base instead.
  
  [mp3 @ 00a4fec0] Using AVStream.codec.time_base as a timebase hint to the muxer
  
  is deprecated. Set AVStream.time_base instead.
  
  Press any key to continue . . .

  The code

  #include 
  
  
  
  #define __STDC_CONSTANT_MACROS
  
  
  
  extern "C"
  
  {
  
      #include "libavformat/avformat.h"
  
  }
  
  
  
  
  
  #define USE_H264BSF 1
  
  
  
  int main()
  
  {
  
      AVOutputFormat *ofmt_a = NULL,*ofmt_v = NULL;
  
      AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx_a = NULL, *ofmt_ctx_v = NULL;
  
      AVPacket pkt;
  
      int ret, i;
  
      int videoindex=-1,audioindex=-1;
  
      int frame_index=0;
  
  
  
      const char *in_filename  = "sample.mp4";
  
      const char *out_filename_v = "sample.h264";
  
      const char *out_filename_a = "sample.mp3";
  
  
  
      av_register_all();
  
      //Input
  
      if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
  
          printf( "Could not open input file.");
  
          goto end;
  
      }
  
      if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
  
          printf( "Failed to retrieve input stream information");
  
          goto end;
  
      }
  
  system("pause");
  
  
  
      //Output
  
      avformat_alloc_output_context2(&ofmt_ctx_v, NULL, NULL, out_filename_v);
  
      if (!ofmt_ctx_v) {
  
          printf( "Could not create output context\n");
  
          ret = AVERROR_UNKNOWN;
  
          goto end;
  
      }
  
      ofmt_v = ofmt_ctx_v->oformat;
  
  
  
  system("pause");
  
  
  
      avformat_alloc_output_context2(&ofmt_ctx_a, NULL, NULL, out_filename_a);
  
      if (!ofmt_ctx_a) {
  
          printf( "Could not create output context\n");
  
          ret = AVERROR_UNKNOWN;
  
          goto end;
  
      }
  
      ofmt_a = ofmt_ctx_a->oformat;
  
  system("pause");
  
      for (i = 0; i < ifmt_ctx->nb_streams; i++) {
  
              //Create output AVStream according to input AVStream
  
              AVFormatContext *ofmt_ctx;
  
              AVStream *in_stream = ifmt_ctx->streams[i];
  
              AVStream *out_stream = NULL;
  
  
  
              if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
  
                  videoindex=i;
  
                  out_stream=avformat_new_stream(ofmt_ctx_v, in_stream->codec->codec);
  
                  ofmt_ctx=ofmt_ctx_v;
  
              }else if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
  
                  audioindex=i;
  
                  out_stream=avformat_new_stream(ofmt_ctx_a, in_stream->codec->codec);
  
                  ofmt_ctx=ofmt_ctx_a;
  
              }else{
  
                  break;
  
              }
  
  
  
              if (!out_stream) {
  
                  printf( "Failed allocating output stream\n");
  
                  ret = AVERROR_UNKNOWN;
  
                  goto end;
  
              }
  
              //Copy the settings of AVCodecContext
  
              if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
  
                  printf( "Failed to copy context from input to output stream codec context\n");
  
                  goto end;
  
              }
  
              out_stream->codec->codec_tag = 0;
  
  
  
              if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
  
                  out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
      }
  
  system("pause");
  
      //Dump Format------------------
  
      printf("\n==============Input Video=============\n");
  
      av_dump_format(ifmt_ctx, 0, in_filename, 0);
  
      printf("\n==============Output Video============\n");
  
      av_dump_format(ofmt_ctx_v, 0, out_filename_v, 1);
  
      printf("\n==============Output Audio============\n");
  
      av_dump_format(ofmt_ctx_a, 0, out_filename_a, 1);
  
      printf("\n======================================\n");
  
      //Open output file
  
      if (!(ofmt_v->flags & AVFMT_NOFILE)) {
  
          if (avio_open(&ofmt_ctx_v->pb, out_filename_v, AVIO_FLAG_WRITE) < 0) {
  
              printf( "Could not open output file '%s'", out_filename_v);
  
              goto end;
  
          }
  
      }
  
  
  
      if (!(ofmt_a->flags & AVFMT_NOFILE)) {
  
          if (avio_open(&ofmt_ctx_a->pb, out_filename_a, AVIO_FLAG_WRITE) < 0) {
  
              printf( "Could not open output file '%s'", out_filename_a);
  
              goto end;
  
          }
  
      }
  
  
  
      //Write file header
  
      if (avformat_write_header(ofmt_ctx_v, NULL) < 0) {
  
          printf( "Error occurred when opening video output file\n");
  
          goto end;
  
      }
  
  
  
      if (avformat_write_header(ofmt_ctx_a, NULL) < 0) {
  
          printf( "Error occurred when opening audio output file\n");
  
          goto end;
  
      }
  
      system("pause");
  
  #if USE_H264BSF
  
      AVBitStreamFilterContext* h264bsfc =  av_bitstream_filter_init("h264_mp4toannexb"); 
  
  #endif
  
  
  
      while (1) {
  
          AVFormatContext *ofmt_ctx;
  
          AVStream *in_stream, *out_stream;
  
          //Get an AVPacket
  
          if (av_read_frame(ifmt_ctx, &pkt) < 0)
  
              break;
  
          in_stream  = ifmt_ctx->streams[pkt.stream_index];
  
  
  
  
  
          if(pkt.stream_index==videoindex){
  
              out_stream = ofmt_ctx_v->streams[0];
  
              ofmt_ctx=ofmt_ctx_v;
  
              #if USE_H264BSF
  
                  av_bitstream_filter_filter(h264bsfc, in_stream->codec, NULL, &pkt.data, &pkt.size, pkt.data, pkt.size, 0);
  
              #endif
  
              printf("Write Video Packet. size:%d\tpts:%lld\n",pkt.size,pkt.pts);
  
          }else if(pkt.stream_index==audioindex){
  
              out_stream = ofmt_ctx_a->streams[0];
  
              ofmt_ctx=ofmt_ctx_a;
  
              printf("Write Audio Packet. size:%d\tpts:%lld\n",pkt.size,pkt.pts);
  
          }else{
  
              continue;
  
          }
  
  
  
  
  
          //Convert PTS/DTS
  
          pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
  
          pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
  
          pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
  
          pkt.pos = -1;
  
          pkt.stream_index=0;
  
          //Write
  
          if (av_interleaved_write_frame(ofmt_ctx, &pkt) < 0) {
  
              printf( "Error muxing packet\n");
  
              break;
  
          }
  
          //printf("Write %8d frames to output file\n", frame_index);
  
          av_free_packet(&pkt);
  
          frame_index++;
  
      }
  
  system("pause");
  
  #if USE_H264BSF
  
      av_bitstream_filter_close(h264bsfc);  
  
  #endif
  
  
  
      //Write file trailer
  
      av_write_trailer(ofmt_ctx_a);
  
      av_write_trailer(ofmt_ctx_v);
  
  end:
  
      avformat_close_input(&ifmt_ctx);
  
      /* close output */
  
      if (ofmt_ctx_a && !(ofmt_a->flags & AVFMT_NOFILE))
  
          avio_close(ofmt_ctx_a->pb);
  
  
  
      if (ofmt_ctx_v && !(ofmt_v->flags & AVFMT_NOFILE))
  
          avio_close(ofmt_ctx_v->pb);
  
  
  
      avformat_free_context(ofmt_ctx_a);
  
      avformat_free_context(ofmt_ctx_v);
  
  
  
      system("pause");
  
      if (ret < 0 && ret != AVERROR_EOF) {
  
          printf( "Error occurred.\n");
  
          return -1;
  
      }
  
  
  
      return 0;
  
  }

  EDIT 1
  After reading through http://lists.libav.org/pipermail/libav-devel/2014-June/060048.html, I figured what was causing the "Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead". I fixed it by adding out_stream->time_base = in_stream->time_base; before the call to avformat_write_header. The code now runs without any error ! The h264 file created with the old FFMPEG (avcodec-55.dll) works fine while that created by the recent avcodec-57.dll is still invalid.